You should first familiarize yourself with the classes of hitches to ensure that you are installing the correct hitch for your vehicle. Check your owner's manual to find the towing capacity of your vehicle that will determine the type of hitch you can install.
Know the weight of the boat or trailer you will be towing. Remember that the gross towing weight will include the weight of the trailer as well as the boat.
A Class 1 hitch typically uses a narrow receiver. This light-duty hitch can only tow up to 2,000 pounds. For a boat, you will probably need to go to a larger hitch. A Class 2 hitch has a heavier construction, more attachment points, and can tow up to 3,500 pounds. A Class 3 hitch is recommended for a boat. This larger hitch has a two-inch receiver and can tow up to 5,000 pounds.
Read and follow the manufacturer's directions for the installation procedures. The manual should tell you whether any drilling would be needed for your particular application. Secure the receiver to the vehicle's frame using hanger bolts and nuts. Place the nuts through the washer and insert the bolts through the predrilled holed in the frame. Carefully lift the hitch into position and insert the threaded bolts through the pre-drilled holes in the hitch. Install the nuts on the bolts and hand-tighten. Place the nuts on all of the bolts first, before you go back and tighten each one individually. With all six bolts installed and tightened to the proper specs, the main portion of the assembly is complete.
The next step is to install the hitch into the receiver. The front end of the hitch simply slides into the receiver. There are different styles and sizes of hitches and they type of trailer you use will determine the drop down length of your hitch. Another variable is the size of the hitch-ball. The size of the hitch-ball will be determined by the type of trailer you use.
Once the hitch is placed in the receiver, it is secured with a receiver pin and cotter-pin safety clip. The final step is to follow the manufacturer's instructions to install the wiring for the trailer lights.